The Complete Works in Philosophy, Politics and Morals of the late Dr. Benjamin Franklin, Vol. 2 [of 3]

By Benjamin Franklin

Page 187

the two.

(iii iii) Side-plates: These have each a pair of ledges to receive
the side-edges of the front-plate, and a little shoulder for it to
rest on; also two pair of ledges to receive the side-edges of the two
middle plates which form the air-box; and an oblong air-hole near the
top, through which is discharged into the room the air warmed in the
air-box. Each has also a wing or bracket, H and I, to keep in falling
brands, coals, &c. and a small hole, Q and R, for the axis of the
register to turn in.

(iv iv) The air-box is composed of the two middle plates, D E and
F G. The first has five thin ledges or partitions cast on it, two
inches deep, the edges of which are received in so many pair of
ledges cast in the other. The tops of all the cavities formed by
these thin deep ledges, are also covered by a ledge of the same form
and depth, cast with them; so that when the plates are put together,
and the joints luted, there is no communication between the air-box
and the smoke. In the winding passages of this box, fresh air is
warmed as it passes into the room.

(v) The front plate is arched on the under side, and ornamented with
foliages, &c. it has no ledges.

(vi) The top plate has a pair of ears, M N, answerable to those in
the bottom plate, and perforated for the same purpose: it has also a
pair of ledges running round the under side, to receive the top edges
of the front, back, and side-plates. The air-box does not reach up to
the top plate by two inches and a half.

(vii) The shutter is of thin wrought iron and light, of such a length
and breadth as to close well the opening of the fire-place. It is
used to blow up the fire, and to shut up and secure it at nights. It
has two brass knobs for handles, _d d_, and commonly slides up and
down in a groove, left, in putting up the fire-place, between the
foremost ledge of the side-plates, and the face of the front plate;
but some chuse to set it aside when it is not in use, and apply it on
occasion.

(viii) The register is also of thin wrought iron. It is placed
between the back plate and air-box, and can, by means of the key S,
be turned on its axis so as to lie in any position between level and
upright.

The screw-rods O P

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Text Comparison with Benjamin Franklin and the First Balloons

Page 0
Benjamin Franklin and the First Balloons BY ABBOTT LAWRENCE ROTCH Reprinted from the Proceedings of the American Antiquarian Society Volume XVIII WORCESTER, MASSACHUSETTS THE DAVIS PRESS 1907 BENJAMIN FRANKLIN AND THE FIRST BALLOONS.
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Charles, Professor of experimental Philosophy at Paris.
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It is suppos'd to have burst by the Elasticity of the contain'd Air when no longer compress'd by so heavy an Atmosphere.
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Pilatre du Rozier has seriously apply'd to the Academy for leave to go up with it, in order to make some Experiments.
Page 4
It was supposed to have risen about 200 Toises: But did not continue long at that height, was carried horizontally by the Wind, and descended gently as the Air within grew cooler.
Page 5
Most is expected from the new one undertaken upon subscription by Messieurs Charles and Robert, who are Men of Science and mechanic Dexterity.
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Multitudes in Paris saw the Balloon passing; but did not know there were Men with it, it being then.
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One of these courageous Philosophers, the Marquis d'Arlandes, did me the honour to call upon me in the Evening after the Experiment, with Mr.
Page 8
Your Philosophy seems to be too bashful.
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FRANKLIN Sir JOS.
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The Wind was very little, so that the Object, tho' moving to the Northward, continued long in View; and it was a great while before the admiring People began to disperse.
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--I hear farther, that the Travellers had perfect Command of their Carriage, descending as they pleas'd by letting some of the inflammable Air escape, and rising again by discharging some Sand; that they descended over a Field so low as to talk with Labourers in passing and mounted again to pass a Hill.
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22, since the ascension of d'Arlandes and de Rozier which, according to the letter, took place the previous day is known to have been on the 21st.
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Faujas de Saint-Fond on Nov.
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unchanged: p.